I never *buy* any of the SBD books anymore, you can just request them from your library for free! I own the basic SBD book and the mini food guide book. Recently my husband ordered the SBD Dining Out guide for his iPhone so we could see what SBD recommends specifically for places we eat out.
I have checked out of my library NUMEROUS times the various SBD cookbooks. Check out your library
Mine allows you to search and request books online and if another library has it, they will transfer it and email you when it is at your local branch- I am assuming many library's have this system now.